Taking a few peppermint oil capsules four hours before a colonoscopy has been shown to reduce colon spasm, which in turn reduces patient pain and discomfort and makes the scope easier to insert and withdraw.

Excess body hair in women, called hirsutism, is caused by excess testosterone. Because of the anti-androgenic effects of peppermint tea, women who drink two cups of peppermint tea a day may experience a drop in free testosterone levels by approximately 30%. Caution is recommended, however, as heavy mint consumption may adversely affect sexual health by lowering libido.

Placebo Effect

Some reported effects of mint usage appear to be due to the placebo effect, so it is important to consult with a reliable source of information before purchasing mint products or essential oils for personal use.